Daclatasvir Impurity B

Chemical Name: methyl ((S)-1-((S)-2-(5-(4'-(2-((S)-1-acetylpyrrolidin-2-yl)-1H-imidazol-5-yl)-[1,1'-biphenyl]-4-yl)-1H-imidazol-2-yl)pyrrolidin-1-yl)-3-methyl-1-oxobutan-2-yl)carbamate

Smile: O=C(OC)N[C@@H](C(C)C)C(N1[C@H](C2=NC=C(C3=CC=C(C4=CC=C(C5=CN=C([C@@H]6N(C(C)=O)CCC6)N5)C=C4)C=C3)N2)CCC1)=O